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In the process of work, crane accessories equipment and mechanism to overcome the following loads: cargo crane hoisting load volume (cargo hoisting mechanism and change the radius by change the cantilever position of luffing mechanism), friction force (some cargo hoisting mechanism, mobile mechanism and the driving equipment of slewing mechanism), the wind load and snow load (all work in the open air driving device). Load is called external load and static load, load them up and dynamic load calculation. Instructions below to determine the role of static load method and list them in the way of traffic equipment and its institutions. Cargo hoisting mechanism of the load, these institutions can move vertically inclined to pieces, repose and liquid cargo. To grab pieces of the goods is by banding wire rope or specialized sling. Steel wire rope structure and cargo strapping method made it possible for the driver in advance taut rope and lift goods smoothly from basis. Similar to the electricity disk upgrade. With rigid spreader to grab the goods when the situation is bad, often happen suddenly pull up the phenomenon of the so-called right now, is when the spreader to considerable movement speed when the goods leave bearing. No matter what fetching method, if the driver can't see the goods, also can happen suddenly pulled up.
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